1 /* exynos_drm_vidi.c 2 * 3 * Copyright (C) 2012 Samsung Electronics Co.Ltd 4 * Authors: 5 * Inki Dae <inki.dae@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 * 12 */ 13 #include <drm/drmP.h> 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/platform_device.h> 18 19 #include <drm/exynos_drm.h> 20 21 #include <drm/drm_edid.h> 22 #include <drm/drm_crtc_helper.h> 23 24 #include "exynos_drm_drv.h" 25 #include "exynos_drm_crtc.h" 26 #include "exynos_drm_encoder.h" 27 28 /* vidi has totally three virtual windows. */ 29 #define WINDOWS_NR 3 30 31 #define get_vidi_context(dev) platform_get_drvdata(to_platform_device(dev)) 32 33 struct vidi_win_data { 34 unsigned int offset_x; 35 unsigned int offset_y; 36 unsigned int ovl_width; 37 unsigned int ovl_height; 38 unsigned int fb_width; 39 unsigned int fb_height; 40 unsigned int bpp; 41 dma_addr_t dma_addr; 42 unsigned int buf_offsize; 43 unsigned int line_size; /* bytes */ 44 bool enabled; 45 }; 46 47 struct vidi_context { 48 struct exynos_drm_subdrv subdrv; 49 struct drm_crtc *crtc; 50 struct vidi_win_data win_data[WINDOWS_NR]; 51 struct edid *raw_edid; 52 unsigned int clkdiv; 53 unsigned int default_win; 54 unsigned long irq_flags; 55 unsigned int connected; 56 bool vblank_on; 57 bool suspended; 58 bool direct_vblank; 59 struct work_struct work; 60 struct mutex lock; 61 }; 62 63 static const char fake_edid_info[] = { 64 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05, 65 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78, 66 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd, 67 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00, 69 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 70 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00, 71 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, 72 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 73 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47, 74 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1, 75 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83, 76 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00, 77 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c, 78 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a, 79 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00, 80 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, 81 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, 82 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 83 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 84 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 85 0x00, 0x00, 0x00, 0x06 86 }; 87 88 static bool vidi_display_is_connected(struct device *dev) 89 { 90 struct vidi_context *ctx = get_vidi_context(dev); 91 92 DRM_DEBUG_KMS("%s\n", __FILE__); 93 94 /* 95 * connection request would come from user side 96 * to do hotplug through specific ioctl. 97 */ 98 return ctx->connected ? true : false; 99 } 100 101 static int vidi_get_edid(struct device *dev, struct drm_connector *connector, 102 u8 *edid, int len) 103 { 104 struct vidi_context *ctx = get_vidi_context(dev); 105 106 DRM_DEBUG_KMS("%s\n", __FILE__); 107 108 /* 109 * the edid data comes from user side and it would be set 110 * to ctx->raw_edid through specific ioctl. 111 */ 112 if (!ctx->raw_edid) { 113 DRM_DEBUG_KMS("raw_edid is null.\n"); 114 return -EFAULT; 115 } 116 117 memcpy(edid, ctx->raw_edid, min((1 + ctx->raw_edid->extensions) 118 * EDID_LENGTH, len)); 119 120 return 0; 121 } 122 123 static void *vidi_get_panel(struct device *dev) 124 { 125 DRM_DEBUG_KMS("%s\n", __FILE__); 126 127 /* TODO. */ 128 129 return NULL; 130 } 131 132 static int vidi_check_timing(struct device *dev, void *timing) 133 { 134 DRM_DEBUG_KMS("%s\n", __FILE__); 135 136 /* TODO. */ 137 138 return 0; 139 } 140 141 static int vidi_display_power_on(struct device *dev, int mode) 142 { 143 DRM_DEBUG_KMS("%s\n", __FILE__); 144 145 /* TODO */ 146 147 return 0; 148 } 149 150 static struct exynos_drm_display_ops vidi_display_ops = { 151 .type = EXYNOS_DISPLAY_TYPE_VIDI, 152 .is_connected = vidi_display_is_connected, 153 .get_edid = vidi_get_edid, 154 .get_panel = vidi_get_panel, 155 .check_timing = vidi_check_timing, 156 .power_on = vidi_display_power_on, 157 }; 158 159 static void vidi_dpms(struct device *subdrv_dev, int mode) 160 { 161 struct vidi_context *ctx = get_vidi_context(subdrv_dev); 162 163 DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode); 164 165 mutex_lock(&ctx->lock); 166 167 switch (mode) { 168 case DRM_MODE_DPMS_ON: 169 /* TODO. */ 170 break; 171 case DRM_MODE_DPMS_STANDBY: 172 case DRM_MODE_DPMS_SUSPEND: 173 case DRM_MODE_DPMS_OFF: 174 /* TODO. */ 175 break; 176 default: 177 DRM_DEBUG_KMS("unspecified mode %d\n", mode); 178 break; 179 } 180 181 mutex_unlock(&ctx->lock); 182 } 183 184 static void vidi_apply(struct device *subdrv_dev) 185 { 186 struct vidi_context *ctx = get_vidi_context(subdrv_dev); 187 struct exynos_drm_manager *mgr = ctx->subdrv.manager; 188 struct exynos_drm_manager_ops *mgr_ops = mgr->ops; 189 struct exynos_drm_overlay_ops *ovl_ops = mgr->overlay_ops; 190 struct vidi_win_data *win_data; 191 int i; 192 193 DRM_DEBUG_KMS("%s\n", __FILE__); 194 195 for (i = 0; i < WINDOWS_NR; i++) { 196 win_data = &ctx->win_data[i]; 197 if (win_data->enabled && (ovl_ops && ovl_ops->commit)) 198 ovl_ops->commit(subdrv_dev, i); 199 } 200 201 if (mgr_ops && mgr_ops->commit) 202 mgr_ops->commit(subdrv_dev); 203 } 204 205 static void vidi_commit(struct device *dev) 206 { 207 struct vidi_context *ctx = get_vidi_context(dev); 208 209 DRM_DEBUG_KMS("%s\n", __FILE__); 210 211 if (ctx->suspended) 212 return; 213 } 214 215 static int vidi_enable_vblank(struct device *dev) 216 { 217 struct vidi_context *ctx = get_vidi_context(dev); 218 219 DRM_DEBUG_KMS("%s\n", __FILE__); 220 221 if (ctx->suspended) 222 return -EPERM; 223 224 if (!test_and_set_bit(0, &ctx->irq_flags)) 225 ctx->vblank_on = true; 226 227 ctx->direct_vblank = true; 228 229 /* 230 * in case of page flip request, vidi_finish_pageflip function 231 * will not be called because direct_vblank is true and then 232 * that function will be called by overlay_ops->commit callback 233 */ 234 schedule_work(&ctx->work); 235 236 return 0; 237 } 238 239 static void vidi_disable_vblank(struct device *dev) 240 { 241 struct vidi_context *ctx = get_vidi_context(dev); 242 243 DRM_DEBUG_KMS("%s\n", __FILE__); 244 245 if (ctx->suspended) 246 return; 247 248 if (test_and_clear_bit(0, &ctx->irq_flags)) 249 ctx->vblank_on = false; 250 } 251 252 static struct exynos_drm_manager_ops vidi_manager_ops = { 253 .dpms = vidi_dpms, 254 .apply = vidi_apply, 255 .commit = vidi_commit, 256 .enable_vblank = vidi_enable_vblank, 257 .disable_vblank = vidi_disable_vblank, 258 }; 259 260 static void vidi_win_mode_set(struct device *dev, 261 struct exynos_drm_overlay *overlay) 262 { 263 struct vidi_context *ctx = get_vidi_context(dev); 264 struct vidi_win_data *win_data; 265 int win; 266 unsigned long offset; 267 268 DRM_DEBUG_KMS("%s\n", __FILE__); 269 270 if (!overlay) { 271 dev_err(dev, "overlay is NULL\n"); 272 return; 273 } 274 275 win = overlay->zpos; 276 if (win == DEFAULT_ZPOS) 277 win = ctx->default_win; 278 279 if (win < 0 || win > WINDOWS_NR) 280 return; 281 282 offset = overlay->fb_x * (overlay->bpp >> 3); 283 offset += overlay->fb_y * overlay->pitch; 284 285 DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch); 286 287 win_data = &ctx->win_data[win]; 288 289 win_data->offset_x = overlay->crtc_x; 290 win_data->offset_y = overlay->crtc_y; 291 win_data->ovl_width = overlay->crtc_width; 292 win_data->ovl_height = overlay->crtc_height; 293 win_data->fb_width = overlay->fb_width; 294 win_data->fb_height = overlay->fb_height; 295 win_data->dma_addr = overlay->dma_addr[0] + offset; 296 win_data->bpp = overlay->bpp; 297 win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) * 298 (overlay->bpp >> 3); 299 win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3); 300 301 /* 302 * some parts of win_data should be transferred to user side 303 * through specific ioctl. 304 */ 305 306 DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n", 307 win_data->offset_x, win_data->offset_y); 308 DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n", 309 win_data->ovl_width, win_data->ovl_height); 310 DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr); 311 DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n", 312 overlay->fb_width, overlay->crtc_width); 313 } 314 315 static void vidi_win_commit(struct device *dev, int zpos) 316 { 317 struct vidi_context *ctx = get_vidi_context(dev); 318 struct vidi_win_data *win_data; 319 int win = zpos; 320 321 DRM_DEBUG_KMS("%s\n", __FILE__); 322 323 if (ctx->suspended) 324 return; 325 326 if (win == DEFAULT_ZPOS) 327 win = ctx->default_win; 328 329 if (win < 0 || win > WINDOWS_NR) 330 return; 331 332 win_data = &ctx->win_data[win]; 333 334 win_data->enabled = true; 335 336 DRM_DEBUG_KMS("dma_addr = 0x%x\n", win_data->dma_addr); 337 338 if (ctx->vblank_on) 339 schedule_work(&ctx->work); 340 } 341 342 static void vidi_win_disable(struct device *dev, int zpos) 343 { 344 struct vidi_context *ctx = get_vidi_context(dev); 345 struct vidi_win_data *win_data; 346 int win = zpos; 347 348 DRM_DEBUG_KMS("%s\n", __FILE__); 349 350 if (win == DEFAULT_ZPOS) 351 win = ctx->default_win; 352 353 if (win < 0 || win > WINDOWS_NR) 354 return; 355 356 win_data = &ctx->win_data[win]; 357 win_data->enabled = false; 358 359 /* TODO. */ 360 } 361 362 static struct exynos_drm_overlay_ops vidi_overlay_ops = { 363 .mode_set = vidi_win_mode_set, 364 .commit = vidi_win_commit, 365 .disable = vidi_win_disable, 366 }; 367 368 static struct exynos_drm_manager vidi_manager = { 369 .pipe = -1, 370 .ops = &vidi_manager_ops, 371 .overlay_ops = &vidi_overlay_ops, 372 .display_ops = &vidi_display_ops, 373 }; 374 375 static void vidi_fake_vblank_handler(struct work_struct *work) 376 { 377 struct vidi_context *ctx = container_of(work, struct vidi_context, 378 work); 379 struct exynos_drm_subdrv *subdrv = &ctx->subdrv; 380 struct exynos_drm_manager *manager = subdrv->manager; 381 382 if (manager->pipe < 0) 383 return; 384 385 /* refresh rate is about 50Hz. */ 386 usleep_range(16000, 20000); 387 388 mutex_lock(&ctx->lock); 389 390 if (ctx->direct_vblank) { 391 drm_handle_vblank(subdrv->drm_dev, manager->pipe); 392 ctx->direct_vblank = false; 393 mutex_unlock(&ctx->lock); 394 return; 395 } 396 397 mutex_unlock(&ctx->lock); 398 399 exynos_drm_crtc_finish_pageflip(subdrv->drm_dev, manager->pipe); 400 } 401 402 static int vidi_subdrv_probe(struct drm_device *drm_dev, struct device *dev) 403 { 404 DRM_DEBUG_KMS("%s\n", __FILE__); 405 406 /* 407 * enable drm irq mode. 408 * - with irq_enabled = 1, we can use the vblank feature. 409 * 410 * P.S. note that we wouldn't use drm irq handler but 411 * just specific driver own one instead because 412 * drm framework supports only one irq handler. 413 */ 414 drm_dev->irq_enabled = 1; 415 416 /* 417 * with vblank_disable_allowed = 1, vblank interrupt will be disabled 418 * by drm timer once a current process gives up ownership of 419 * vblank event.(after drm_vblank_put function is called) 420 */ 421 drm_dev->vblank_disable_allowed = 1; 422 423 return 0; 424 } 425 426 static void vidi_subdrv_remove(struct drm_device *drm_dev, struct device *dev) 427 { 428 DRM_DEBUG_KMS("%s\n", __FILE__); 429 430 /* TODO. */ 431 } 432 433 static int vidi_power_on(struct vidi_context *ctx, bool enable) 434 { 435 struct exynos_drm_subdrv *subdrv = &ctx->subdrv; 436 struct device *dev = subdrv->dev; 437 438 DRM_DEBUG_KMS("%s\n", __FILE__); 439 440 if (enable != false && enable != true) 441 return -EINVAL; 442 443 if (enable) { 444 ctx->suspended = false; 445 446 /* if vblank was enabled status, enable it again. */ 447 if (test_and_clear_bit(0, &ctx->irq_flags)) 448 vidi_enable_vblank(dev); 449 450 vidi_apply(dev); 451 } else { 452 ctx->suspended = true; 453 } 454 455 return 0; 456 } 457 458 static int vidi_show_connection(struct device *dev, 459 struct device_attribute *attr, char *buf) 460 { 461 int rc; 462 struct vidi_context *ctx = get_vidi_context(dev); 463 464 mutex_lock(&ctx->lock); 465 466 rc = sprintf(buf, "%d\n", ctx->connected); 467 468 mutex_unlock(&ctx->lock); 469 470 return rc; 471 } 472 473 static int vidi_store_connection(struct device *dev, 474 struct device_attribute *attr, 475 const char *buf, size_t len) 476 { 477 struct vidi_context *ctx = get_vidi_context(dev); 478 int ret; 479 480 DRM_DEBUG_KMS("%s\n", __FILE__); 481 482 ret = kstrtoint(buf, 0, &ctx->connected); 483 if (ret) 484 return ret; 485 486 if (ctx->connected > 1) 487 return -EINVAL; 488 489 /* use fake edid data for test. */ 490 if (!ctx->raw_edid) 491 ctx->raw_edid = (struct edid *)fake_edid_info; 492 493 /* if raw_edid isn't same as fake data then it can't be tested. */ 494 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 495 DRM_DEBUG_KMS("edid data is not fake data.\n"); 496 return -EINVAL; 497 } 498 499 DRM_DEBUG_KMS("requested connection.\n"); 500 501 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev); 502 503 return len; 504 } 505 506 static DEVICE_ATTR(connection, 0644, vidi_show_connection, 507 vidi_store_connection); 508 509 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, 510 struct drm_file *file_priv) 511 { 512 struct vidi_context *ctx = NULL; 513 struct drm_encoder *encoder; 514 struct exynos_drm_manager *manager; 515 struct exynos_drm_display_ops *display_ops; 516 struct drm_exynos_vidi_connection *vidi = data; 517 struct edid *raw_edid; 518 int edid_len; 519 520 DRM_DEBUG_KMS("%s\n", __FILE__); 521 522 if (!vidi) { 523 DRM_DEBUG_KMS("user data for vidi is null.\n"); 524 return -EINVAL; 525 } 526 527 if (vidi->connection > 1) { 528 DRM_DEBUG_KMS("connection should be 0 or 1.\n"); 529 return -EINVAL; 530 } 531 532 list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list, 533 head) { 534 manager = exynos_drm_get_manager(encoder); 535 display_ops = manager->display_ops; 536 537 if (display_ops->type == EXYNOS_DISPLAY_TYPE_VIDI) { 538 ctx = get_vidi_context(manager->dev); 539 break; 540 } 541 } 542 543 if (!ctx) { 544 DRM_DEBUG_KMS("not found virtual device type encoder.\n"); 545 return -EINVAL; 546 } 547 548 if (ctx->connected == vidi->connection) { 549 DRM_DEBUG_KMS("same connection request.\n"); 550 return -EINVAL; 551 } 552 553 if (vidi->connection) { 554 if (!vidi->edid) { 555 DRM_DEBUG_KMS("edid data is null.\n"); 556 return -EINVAL; 557 } 558 raw_edid = (struct edid *)(uint32_t)vidi->edid; 559 edid_len = (1 + raw_edid->extensions) * EDID_LENGTH; 560 ctx->raw_edid = kzalloc(edid_len, GFP_KERNEL); 561 if (!ctx->raw_edid) { 562 DRM_DEBUG_KMS("failed to allocate raw_edid.\n"); 563 return -ENOMEM; 564 } 565 memcpy(ctx->raw_edid, raw_edid, edid_len); 566 } else { 567 /* 568 * with connection = 0, free raw_edid 569 * only if raw edid data isn't same as fake data. 570 */ 571 if (ctx->raw_edid && ctx->raw_edid != 572 (struct edid *)fake_edid_info) { 573 kfree(ctx->raw_edid); 574 ctx->raw_edid = NULL; 575 } 576 } 577 578 ctx->connected = vidi->connection; 579 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev); 580 581 return 0; 582 } 583 584 static int vidi_probe(struct platform_device *pdev) 585 { 586 struct device *dev = &pdev->dev; 587 struct vidi_context *ctx; 588 struct exynos_drm_subdrv *subdrv; 589 int ret; 590 591 DRM_DEBUG_KMS("%s\n", __FILE__); 592 593 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 594 if (!ctx) 595 return -ENOMEM; 596 597 ctx->default_win = 0; 598 599 INIT_WORK(&ctx->work, vidi_fake_vblank_handler); 600 601 subdrv = &ctx->subdrv; 602 subdrv->dev = dev; 603 subdrv->manager = &vidi_manager; 604 subdrv->probe = vidi_subdrv_probe; 605 subdrv->remove = vidi_subdrv_remove; 606 607 mutex_init(&ctx->lock); 608 609 platform_set_drvdata(pdev, ctx); 610 611 ret = device_create_file(&pdev->dev, &dev_attr_connection); 612 if (ret < 0) 613 DRM_INFO("failed to create connection sysfs.\n"); 614 615 exynos_drm_subdrv_register(subdrv); 616 617 return 0; 618 } 619 620 static int vidi_remove(struct platform_device *pdev) 621 { 622 struct vidi_context *ctx = platform_get_drvdata(pdev); 623 624 DRM_DEBUG_KMS("%s\n", __FILE__); 625 626 exynos_drm_subdrv_unregister(&ctx->subdrv); 627 628 if (ctx->raw_edid != (struct edid *)fake_edid_info) { 629 kfree(ctx->raw_edid); 630 ctx->raw_edid = NULL; 631 } 632 633 return 0; 634 } 635 636 #ifdef CONFIG_PM_SLEEP 637 static int vidi_suspend(struct device *dev) 638 { 639 struct vidi_context *ctx = get_vidi_context(dev); 640 641 return vidi_power_on(ctx, false); 642 } 643 644 static int vidi_resume(struct device *dev) 645 { 646 struct vidi_context *ctx = get_vidi_context(dev); 647 648 return vidi_power_on(ctx, true); 649 } 650 #endif 651 652 static const struct dev_pm_ops vidi_pm_ops = { 653 SET_SYSTEM_SLEEP_PM_OPS(vidi_suspend, vidi_resume) 654 }; 655 656 struct platform_driver vidi_driver = { 657 .probe = vidi_probe, 658 .remove = vidi_remove, 659 .driver = { 660 .name = "exynos-drm-vidi", 661 .owner = THIS_MODULE, 662 .pm = &vidi_pm_ops, 663 }, 664 }; 665